Abstract: A direction deciding unit calculates a plane the perpendicular of which is a directional vector from the wireless communication apparatus toward a radio station. A group deciding unit decides, as groups, antenna combinations each consisting of some ones but not all of a plurality of antennas. A distance calculating unit calculates the distances each between the coordinates of antennas projected, in parallel with the directional vector, onto the plane, and further calculates, for each group, as a group shortest-distance of the group, the shortest one of the calculation results of the distances each between the coordinates of the antennas constituting the group. An identifying unit identifies a group the group shortest-distance of which is the longest. A plurality of communication units communicate with the radio station by use of respective ones of a plurality of antennas in the group identified by the identifying unit.

Abstract: An object of the present invention is to provide an antenna device that exhibits, in wireless communication of an omni-cell system for simultaneously transmitting a plurality of data corresponding to one another, excellent cost performance, and can reduce antenna loss and prevent radio wave interference. This antenna device includes a plurality of sector antennas 11 disposed so that a maximum radial direction where radiation intensity of a radio wave becomes maximum is radially set. The plurality of sector antennas 11 simultaneously transmit a plurality of wireless signals corresponding to one another.

Abstract: An array antenna includes: a plurality of first antenna elements arrayed at specified element intervals on a plane of a board; a plurality of second antenna elements arrayed at the element intervals in parallel to an array direction of the first antenna elements on the plane; a first power supply circuit for supplying electric power to the respective first antenna elements by a line branched at a first branch point on the plane; and a second power supply circuit for supplying electric power to the respective second antenna elements by a line branched at a second branch point shifted by a specified distance in the array direction with respect to the first branch point on the plane.

Abstract: A first printed circuit board for vertical polarized wave has a plurality of vertical polarized wave elements which serves as antenna elements, and a first feeder circuit which is connected to the plurality of vertical polarized wave elements. A second printed circuit board for horizontal polarized wave has a second feeder circuit which is connected to a plurality of horizontal polarized wave elements which serves as antenna elements, and is mounted with the plurality of horizontal polarized wave elements. A cutout portion is provided between the adjacent two vertical polarized wave elements of the first printed circuit board, and the first and second printed circuit boards are arranged parallel so that the horizontal polarized wave elements are arranged in the cutout portions of the first printed circuit board.

Abstract: An antenna device of the invention comprises divider/combiner means 12 that divides or combines a received signal into signals having a first phase distribution represented by an odd function, phase adding/removing means 14-1 that adds phases having a second phase distribution represented by an even function to the signals, or removes the phases from the signals, and a plurality of antenna elements 20 arranged in an array configuration, that transmits or receives the signals to which the phases have been added.

Abstract: An antenna device of the invention comprises divider/combiner means 12 that divides or combines a received signal into signals having a first phase distribution represented by an odd function, phase adding/removing means 14-1 that adds phases having a second phase distribution represented by an even function to the signals, or removes the phases from the signals, and a plurality of antenna elements 20 arranged in an array configuration, that transmits or receives the signals to which the phases have been added.

Abstract: A first printed circuit board for vertical polarized wave has a plurality of vertical polarized wave elements which serves as antenna elements, and a first feeder circuit which is connected to the plurality of vertical polarized wave elements. A second printed circuit board for horizontal polarized wave has a second feeder circuit which is connected to a plurality of horizontal polarized wave elements which serves as antenna elements, and is mounted with the plurality of horizontal polarized wave elements. A cutout portion is provided between the adjacent two vertical polarized wave elements of the first printed circuit board, and the first and second printed circuit boards are arranged parallel so that the horizontal polarized wave elements are arranged in the cutout portions of the first printed circuit board.

Abstract: To suppress a loss in the operation due to electromagnetic coupling of a plurality of antenna elements which boot up reading/writing action of RFID tags that are attached to a large number of densely placed commodity media. A commodity managing antenna for booting up reading/writing action of RFID tags attached to commodity media that are densely stored on a shelf comprises: a plurality of loop-type antenna elements arranged in parallel at a constant interval on the shelf where the commodity media are densely stored; a first switch for selectively supplying electricity to one of the antenna elements; and a plurality of second switches inserted to each loop of the antenna elements which, when one of the antenna elements to which the electricity is supplied by the first switch is resonating, electrically disconnect the loops of remaining antenna elements so that those antenna elements become non-resonant.

Abstract: An adhesive tape (a) which combines light reflectivity and light shielding characteristics, which is used for bonding between an LCD panel and a backlight case of an LCD module; (b) and which comprises a backing formed by laminating a light reflective layer and a light shielding layer, and an adhesive layer provided on at least one surface of the backing; (c) wherein the light reflective layer is formed of a white resin film with a thickness within a range from 10 to 30 &mgr;m, and a tensile strength of at least 10.0 N/10 mm.

Abstract: A double coated pressure sensitive adhesive sheet used for fixing a part of an electronic device including an adhesive layer. At least one of the adhesive layers of the double coated pressure sensitive adhesive sheet has a maximum of loss tangent in a frequency region equal to or larger than a maximum characteristic frequency generated by a shock when the electronic device falls. The maximum of the loss tangent is equal to or greater than 1.

Abstract: A helical antenna includes an element, a feeder circuit, and a connector that connects the element and feeder circuit. The element includes a cylindrical member composed of a dielectric and a plurality of radiation elements that are provided in helical form at intervals on the. outer surface of this cylindrical member. The feeder circuit is mounted on a circuit board that is arranged below the cylindrical member. The connector is arranged between the circuit board and the cylindrical member and is composed of an insulating material that is provided in a solid unit with connection pins that electrically connect the ends of the radiation elements to the circuit board.

Abstract: A helical antenna comprising a cylindrical dielectric member 1, four spiral conductors 2a to 2d which are wound around the outer wall of the cylindrical dielectric member 1, four spiral conductors 3a to 3d which are attached to the inner wall of the cylindrical dielectric member 1, and power supply circuits 4, 5 for supplying high-frequency power to the spiral conductors 2a to 2d and the spiral conductors 3a to 3d respectively. That is, the spiral conductors serving as radiation elements are disposed at the outside and inside of the cylindrical dielectric member, and the outer and inner conductors are operated as independent helical antennas. These spiral conductors are connected to the power supply circuits for supplying the high-frequency power having desired amplitude and phase.

Abstract: A helical antenna capable of covering a plurality of frequency bands and using a common feeder system for antenna elements adjusted to the respective frequency bands. First and second antenna elements having lengths corresponding to wavelengths of the frequency bands to be used are arranged helically at a specified pitch angle and spaced apart in the circumferential direction of a cylindrical body on the surface of a dielectric sheet wound around the outer circumferential surface of the cylindrical body. Coupling lines to be electromagnetically coupled to one-side ends of the antenna elements being adjacent to one another are formed on the surface of the dielectric sheet. A signal is fed from a common feeder circuit through the coupling lines to the respective antenna elements.

Abstract: A lens antenna having high antenna efficiency, low sidelobe levels, and that is easily assembled. The lens antenna includes a first horn made of a metallic conductor, a second horn made of a high-frequency absorbing plastic material, and a lens for controlling the power distribution at an aperature of the horn. Screws may be used to assemble the first horn, the second horn, and the lens. Though some of the microwave signals input through the circular waveguide of the first horn are reflected on the surface of the lens, most of the microwave signals are absorbed by the second horn. Moreover, because no wave absorber is bonded to an inner wall of a conical horn, nothing screens the microwave signal, the power density distribution at the aperture of the lens is not disrupted. Therefore, it is possible to obtain a desired power density distribution.

Abstract: A patch antenna has: a driven patch fed with a high-frequency signal and radiates a high-frequency electromagnetic field from its one surface; a parasitic patch receives the high-frequency electromagnetic field from the driven patch at a first surface and reradiates the high-frequency electromagnetic field from a second surface; and a radome which protectively holds the driven patch and the parasitic patch inside of the radome; wherein the parasitic patch is held by the inner surface of the radome which contacts the second surface of the parasitic patch and by a holder which protrudes from the inner surface of the radome and covers a part of the first surface of the parasitic patch.

Abstract: A lens antenna is disclosed which comprises a conical horn and a lens attached to an aperture of the horn. The lens has a first planar surface at a first side which faces free space and a hyperboloid of revolution at a second side opposite the first side and is made of a dielectric material with relative permittivity ranging from 2 to 4. The lens is provided with a cylindrical portion which has a second planar surface parallel to the first planar surface and displaced from the first planar surface by a predetermined distance. The cylindrical portion being concentric with the lens.

Abstract: In a helical antenna where a helical conductor is spirally wound on a coaxial cable, spacings between turns of the helical conductor are changed in accordance with the positions of the turns.